Mercurial > hg > truffle
view graal/com.oracle.max.asmdis/src/com/sun/max/asm/gen/risc/bitRange/OmittedBitRange.java @ 4138:82af018d61db
Merge fixes.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 22:03:44 +0100 |
parents | e233f5660da4 |
children |
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/* * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.max.asm.gen.risc.bitRange; /** * A range of bits that contributes to a field's value but does not occupy any bit * positions in an instruction. The implicit bits are 0. This type of bit range * is typically used to represent the low-order bits for a field value's that is * always modulo {@code n} where {@code n > 1}. That is, an aligned value. */ public class OmittedBitRange extends ContiguousBitRange { private int width; OmittedBitRange(int width) { this.width = width; assert width > 0; } @Override public int width() { return width; } @Override public int encodedWidth() { return 0; } @Override public BitRange move(boolean left, int bits) { return this; } /* Accessing */ @Override public int instructionMask() { return 0; } @Override public int numberOfLessSignificantBits() { return 32; } @Override public boolean equals(Object other) { if (!(other instanceof OmittedBitRange)) { throw new IllegalArgumentException("Invalid argument type"); } final OmittedBitRange omittedBitRange = (OmittedBitRange) other; return width == omittedBitRange.width; } @Override public int hashCode() { return width; } /* Extracting */ @Override public int extractSignedInt(int syllable) { return 0; } @Override public int extractUnsignedInt(int syllable) { return 0; } /* Inserting */ @Override public int assembleUncheckedSignedInt(int signedInt) { return 0; } @Override public int assembleUncheckedUnsignedInt(int unsignedInt) { return 0; } @Override public String encodingString(String value, boolean signed, boolean checked) { return ""; } @Override public String toString() { return "omit" + width; } }